US11780418B2 - Electro-hydraulic braking system - Google Patents

Electro-hydraulic braking system Download PDF

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Publication number
US11780418B2
US11780418B2 US17/116,820 US202017116820A US11780418B2 US 11780418 B2 US11780418 B2 US 11780418B2 US 202017116820 A US202017116820 A US 202017116820A US 11780418 B2 US11780418 B2 US 11780418B2
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braking system
inlet line
line
outlet
inlet
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US20220144234A1 (en
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Sung Ki Ahn
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Hyundai Mobis Co Ltd
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Hyundai Mobis Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
    • B60T13/14—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps
    • B60T13/142—Systems with master cylinder
    • B60T13/145—Master cylinder integrated or hydraulically coupled with booster
    • B60T13/146—Part of the system directly actuated by booster pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/343—Systems characterised by their lay-out
    • B60T8/344—Hydraulic systems
    • B60T8/346—2 Channel systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
    • B60T13/14—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using accumulators or reservoirs fed by pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
    • B60T13/16—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using pumps directly, i.e. without interposition of accumulators or reservoirs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/58—Combined or convertible systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
    • B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
    • B60T15/02—Application and release valves
    • B60T15/025—Electrically controlled valves
    • B60T15/028—Electrically controlled valves in hydraulic systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T7/00—Brake-action initiating means
    • B60T7/02—Brake-action initiating means for personal initiation
    • B60T7/04—Brake-action initiating means for personal initiation foot actuated
    • B60T7/042—Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/341—Systems characterised by their valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4018—Pump units characterised by their drive mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/48—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
    • B60T8/4809—Traction control, stability control, using both the wheel brakes and other automatic braking systems
    • B60T8/4827—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/88—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means
    • B60T8/92—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means automatically taking corrective action
    • B60T8/94—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means automatically taking corrective action on a fluid pressure regulator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T2201/00—Particular use of vehicle brake systems; Special systems using also the brakes; Special software modules within the brake system controller
    • B60T2201/03—Brake assistants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T2270/00—Further aspects of brake control systems not otherwise provided for
    • B60T2270/20—ASR control systems
    • B60T2270/203—ASR control systems hydraulic system components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T2270/00—Further aspects of brake control systems not otherwise provided for
    • B60T2270/40—Failsafe aspects of brake control systems
    • B60T2270/402—Back-up
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2400/00—Special features of vehicle units
    • B60Y2400/81—Braking systems

Definitions

  • the present disclosure relates to an electro-hydraulic braking system.
  • An autonomous driving vehicle ensures a fail-safe function by means of an auxiliary braking system disposed between a main braking system and a plurality of wheel brake apparatuses when a function abnormality occurs in a main braking system.
  • a conventional auxiliary braking system performs a 2-channel compression/decompression control and a 2-channel decompression control.
  • a conventional auxiliary braking system performs a compression/decompression function for the front wheels and a decompression function for the rear wheels.
  • a total of eight pipelines, including four input pipelines and four output pipelines, should be connected to the auxiliary braking system.
  • the present disclosure aims mainly to provide an electro-hydraulic braking system including an auxiliary braking system capable of performing a 2-channel compression and decompression control and a 1-channel decompression control.
  • an electrically powered hydraulic braking system including: a reservoir for storing brake oil; a plurality of wheel brake apparatuses configured to provide a braking force to a plurality of wheels by providing hydraulic pressure; a main braking system disposed between the reservoir and the plurality of wheels brake apparatuses and configured to deliver brake oil discharged from the reservoir to the wheel brake apparatuses; and an auxiliary braking system disposed between the main braking system and the plurality of wheel brake apparatuses, wherein the auxiliary braking system includes: a first inlet line, a second inlet line, and a third inlet line which are configured to delivery hydraulic pressure between the main braking system and the wheel brake apparatuses; an actuating unit which is connected to a point on the first inlet line and a point on the second inlet line, is configured to increase the internal hydraulic pressure of the first outlet line and the internal hydraulic pressure of second inlet line, and includes a first pump and a second pump; a
  • an electro-hydraulic braking system includes an auxiliary braking system capable of performing a 2-channel compression/decompression control and a 1-channel decompression control, and thereby the manufacturing cost can be reduced and the assembly procedure can be more easily facilitated.
  • FIG. 1 shows a hydraulic circuit of an electro-hydraulic braking system according to an embodiment of the present disclosure.
  • forward indicates a portion disposed at a closer distance from a reservoir 10 as brake oil flows
  • backward indicates a portion disposed at a farther distance from the reservoir 10 as the brake oil flows. This, however, not only means that the line is directly continuous forwardly or backwardly, but also means a position is located at a relatively farther portion, even if spaced apart.
  • FIG. 1 is a hydraulic circuit diagram of an electro-hydraulic braking system according to an embodiment of the present disclosure.
  • a hydraulic circuit diagram shown in FIG. 1 is merely for showing each component conceptually for convenience of explanation, and it is should be noted that the actual positions of an actual hydraulic pressure block and lines formed inside the hydraulic pressure block may vary.
  • an inlet line is indicated as a thick line
  • an outlet line is indicated as an intermediate line
  • a circulation line is indicated as a thin line.
  • a reservoir 10 , a brake pedal 11 , and the specific components of a main braking system 20 in the present disclosure may be easily implemented by those skilled in the art, and thus specific illustrations and descriptions relating thereto are omitted.
  • the present disclosure shows the wheel brake apparatuses of which the hydraulic pressures are regulated by the auxiliary braking system 100 as being a front right wheel brake apparatus FR, a front left wheel brake apparatus FL, and a rear left wheel brake apparatus RL, this is merely an example.
  • the wheel brake apparatuses may be any three of the front right wheel, the front left wheel, the rear right wheel, and the rear left wheel.
  • the electro-hydraulic braking system 1 may include all or a part of a reservoir 10 , a brake pedal 11 , a main braking system 20 , and an auxiliary braking system 100 .
  • the reservoir 10 is configured to store brake oil therein.
  • the brake pedal 11 leads a translational motion of a piston (not shown) disposed inside a master cylinder (not shown) of the main braking system 20 as a response to the pedaling of a user.
  • the plurality of wheel brake apparatuses FR, FL, and RL apply a braking force on a plurality of wheels (not shown) by utilizing the hydraulic pressure of the brake oil discharged from the reservoir 10 .
  • an electric control unit (not shown) detects the driver's braking request by means of a pedal travel sensor (PTS, not shown).
  • the electric control unit which detects the driver's braking request generates a braking signal.
  • the braking signal is an electrical signal which is delivered in order to cause the respective braking system 20 , 100 to generate a corresponding braking force depending on the degree of pedaling of the driver on the brake pedal 11 .
  • the main braking system 20 is disposed between the reservoir 10 and the plurality of wheel brake apparatuses FR, FL, and RL, and is configured to deliver the brake oil discharged from the reservoir 10 to the plurality of the wheel brake apparatuses FR, FL, and RL and to control the hydraulic pressure of the brake oil.
  • the electric control unit delivers an auxiliary braking signal to the auxiliary braking system 100 .
  • the auxiliary braking signal is delivered by the electric control unit to the auxiliary braking system 100 , all or a part of the components of the auxiliary braking system 100 are actuated.
  • the electro-hydraulic braking system 1 may, hereby, perform a fail-safe function.
  • the auxiliary braking system 100 is disposed between the main braking system 20 and the plurality of wheel brake apparatuses FR, FL and RL. In the event that an abnormality in the main braking system 20 occurs during an autonomous driving of a vehicle or in the event that an abnormality in the main braking system 20 occurs when the driver intervenes in direct braking, the auxiliary braking system 100 is actuated.
  • the auxiliary braking system 100 includes all or a part of hydraulic pressure input units 101 , 102 and 103 , hydraulic pressure output units 104 , 105 and 106 , inlet lines 111 , 112 and 113 , an actuating unit, traction control valves TCV 1 and TCV 2 , inlet valves FRIV and FLIV, outlet lines 121 , 122 and 123 , outlet valves FROV, FLOV and RLOV, accumulators A 1 and A 2 , oil chambers 131 and 132 , circulation lines 141 and 142 , and high pressure switching valves HSV 1 and HSV 2 .
  • At least one of the hydraulic pressure input units 101 , 102 , and 103 is/are disposed on a line through which the brake oil discharged from the main braking system 20 flows to the auxiliary braking system 100 .
  • the hydraulic pressure input units 101 , 102 and 103 allow the inlet lines 111 , 112 and 113 to be in fluid communication with the main braking system 20 .
  • the hydraulic pressure input units 101 , 102 and 103 are disposed at the boundary of the auxiliary braking system 100 .
  • the auxiliary braking system 100 includes a first inlet line 111 , a second inlet line 112 , and a third inlet line 113 , and accordingly the auxiliary braking system 100 includes a first hydraulic pressure input unit 101 , a second hydraulic pressure input unit 102 , and a third hydraulic pressure input unit 103 .
  • At least one of the hydraulic pressure output units 104 , 105 , and 106 is/are disposed on a line through which the brake oil discharged from the auxiliary braking system 100 flows to the plurality of wheel brake apparatuses FR, FL, and RL.
  • the hydraulic pressure output units 104 , 105 and 106 allow the inlet lines 111 , 112 , and 113 to be in fluid communication with the plurality of wheel brake apparatuses FR, FL, and RL.
  • the auxiliary braking system 100 includes a first hydraulic pressure output unit 104 , a second hydraulic pressure output unit 105 , and a third hydraulic pressure output unit 106 .
  • the inlet lines 111 , 112 , and 113 are formed between the hydraulic pressure input units 101 , 102 , and 103 and the hydraulic pressure output units 104 , 105 and 106 , and deliver the brake oil discharged from the main braking system 20 to the plurality of wheel brake apparatuses FR, FL, and RL.
  • the inlet lines 111 , 112 , and 113 include a first inlet line 111 , a second inlet line 112 , and a third inlet line 113 .
  • the first inlet line 111 is configured to deliver all or a part of the brake oil discharged from the main braking system 20 to a first wheel brake apparatus FR. Further, the second inlet line 112 is configured to deliver all or a part of the brake oil discharged from the main braking system 20 to the second wheel brake apparatus FL.
  • the hydraulic pressure of the fluid flowing inside the first inlet line 111 and the second inlet line 112 may be increased by an actuating unit.
  • the actuating unit includes a motor which is configured to actuate a first pump SP 1 and a second pump SP 2 , and pumps SP 1 and SP 2 .
  • the outlet portion of the first pump SP 1 is connected to a point on the first inlet line 111 .
  • the outlet portion of the second pump SP 2 is connected to a point on the second inlet line 112 .
  • a first traction control valve TCV 1 is disposed at a point on the first inlet line 111 , and opening and closing of the first inlet line 111 are regulated by the first traction control valve TCV 1 .
  • the first traction control valve TCV 1 is disposed forward of the point where the first inlet line and the outlet portion of the first pump SP 1 are connected.
  • the first traction control valve TCV 1 is formed as a normally open type. Therefore, in a non-powered mode where the auxiliary braking signal is not applied, the first traction control valve TCV 1 is opened. When the first traction control valve TCV 1 is closed, a portion of the brake oil compressed by the first pump SP 1 may not flow backwardly to the main braking system 20 .
  • a first inlet valve FRIV is disposed at another point on the first inlet line 111 , and opening and closing of the first inlet line 111 are regulated by the first inlet valve FRIV. Meanwhile, the first inlet valve FRIV is disposed backward of the point where the first inlet line 111 and the outlet portion of the first pump SP 1 are connected.
  • the first inlet valve FRIV is formed as a normal open type. Therefore, in the non-powered mode where the auxiliary braking signal is not applied, the first inlet valve FRIV is opened. When the first inlet valve FRIV is closed, a portion of the brake oil compressed by the first pump SP 1 is not delivered to the wheel brake apparatus FR. As a result, the pressure control of the brake oil is enabled.
  • the descriptions for the second inlet line 112 , the second traction control valve TCV 2 , and the second inlet valve FLIV are replaced with the descriptions for the first inlet line 111 , the first traction control valve TCV 1 , and the first inlet valve FRIV, respectively.
  • the third inlet line 113 is configured to deliver all or part of the brake oil discharged from the main braking system 20 to the third wheel brake apparatus RL.
  • a line (not shown) connected to the third hydraulic pressure input unit 103 may be in a short circuit structure inside the main braking system 20 .
  • the electric control unit delivers an auxiliary braking signal
  • the third inlet line 113 may be directly connected to the reservoir 10 .
  • the hydraulic pressure which is increased by the pedaling of the brake pedal 11 , may be directly delivered to the third wheel brake apparatus RL.
  • the auxiliary braking system 100 is capable of performing 2-channel compression control.
  • the outlet lines 121 , 122 , and 123 are connected to a point on the inlet lines 111 , 112 , and 113 , so that at least some of the brake oil in the inlet line 111 , 112 , and 113 diverges.
  • the outlet lines 121 , 122 , and 123 include a first outlet line 121 , a second outlet line 122 , and a third outlet line 123 .
  • One end of the first outlet line 121 is connected to a bifurcation on the first inlet line 111 , the bifurcation being formed backward of the first inlet valve FRIV, and the other end is connected to the entrance portion of the first pump SP 1 .
  • a first outlet valve FROV is disposed at a point on the first outlet line 121 , and opening and closing of the first outlet line 121 are regulated by the first outlet valve FROV.
  • the first outlet valve FROV is formed as a normally close type. Thus, in the non-powered mode where the auxiliary braking signal is not applied, the first outlet valve FROV is closed.
  • the first outlet valve FROV is opened, at least some of the compressed brake oil flowing through the first inlet line 111 is discharged to the first outlet line 121 .
  • the hydraulic pressure delivered to the first wheel brake apparatus FR may be reduced.
  • a first accumulator A 1 may be further disposed at another point on the first outlet line 121 formed backward of the first outlet valve FROV.
  • the first accumulator A 1 is configured to temporarily receive all or a part of the brake oil delivered from the first outlet line 121 .
  • a damage occurred in the first outlet line by the fluctuation of the brake oil may be minimized
  • what is said by the damage occurred in the first outlet line 121 includes, for example, a fatigue, a transformation, an abrasion, and the like, which are occurred in at least part of the line, when the line is exposed to a continuous fluctuation for a long period of time.
  • the descriptions for the second outlet line 122 , the second outlet valve FLOV, and the second accumulator A 2 are replaced by the descriptions for the first outlet line 121 , the first outlet valve FROV, and the first accumulator A 1 , respectively.
  • an electronic control unit (not shown) of the auxiliary braking system 100 determines whether to use the accumulators A 1 and A 2 depending on the required braking. For example, in the case of slow braking, only a part of each outlet valve FROV, FLOV and RLOV is opened, so that the brake oil flows only through the opened outlet lines 121 , 122 , and 123 and diverges from the inlet lines 111 , 112 , and 113 .
  • the brake oil is not received in the accumulators A 1 and A 2 .
  • the third outlet line 123 is connected to a point on the third inlet line 113 at one end, and connected to the first outlet line 121 at the other end.
  • the point at which the third outlet line 123 and the first outlet line 121 are connected is formed backward of the first outlet valve FROV.
  • the brake oil delivered through the third outlet line 123 may join the brake oil flowing in the first outlet line 121 .
  • the third outlet line 123 is connected to at least one of the first outlet line 121 and the second outlet line 122 .
  • the first outlet line 121 and the second outlet line 122 may be connected and in fluid communication.
  • the brake oil delivered through the third outlet line 123 may be received in at least one of the first accumulator A 1 and the second accumulator A 2 .
  • the present disclosure is not necessarily limited to this and the first outlet line 121 and the second outlet line 122 may not be connected.
  • the brake oil delivered through the third outlet line 122 joins only to the first outlet line 121 , and is received only in the first accumulator A 1 .
  • a third outlet valve RLOV is disposed at a point on the third outlet line 123 , and opening and closing of the third outlet line 123 are regulated by the third outlet valve RLOV.
  • the third outlet valve RLOV is formed as a normally close type. Thus, in the non-powered mode, the third outlet valve RLOV is closed. When the third outlet valve RLOV is opened, at least some of the compressed brake oil flowing through the third inlet line 113 diverges to the third outlet line 123 . As a result, the hydraulic pressure delivered to the third wheel brake apparatus RL may be reduced.
  • the hydraulic pressures provided into the wheel brake apparatuses FR, FL, and RL are reduced as the outlet valves FROV, FLOV, and RLOV are opened. That is, the auxiliary braking system 100 may perform a 3-channel decompression control.
  • the auxiliary braking system 100 does not participate in the control of compression/decompression in the wheel brake apparatus for the rear right wheel. That is, the auxiliary braking system 100 is capable of performing a 2-channel compression/decompression control and a 1-channel decompression control. Therefore, the auxiliary braking system 100 according to the present disclosure including the electro-hydraulic braking system 100 , may include three lines connected to three hydraulic pressure input units 101 , 102 , and 103 and three lines connected to three hydraulic pressure output units 104 , 105 , and 106 .
  • the auxiliary braking system 100 While more than eight lines should be connected to the auxiliary braking system for 4-channel compression/decompression in the conventional auxiliary braking systems, the auxiliary braking system 100 according to the present disclosure enables an auxiliary braking function even if a total of six lines are connected thereto. Accordingly, the electro-hydraulic braking system 1 according to the present disclosure has an effect of cost reduction. Furthermore, during vehicle manufacturing, the piping work of the auxiliary braking system 100 is advantageously simplified, and the assembly of the vehicle is simplified.
  • a first oil chamber 131 may also be disposed on the first inlet line 111 .
  • the first oil chamber 131 is disposed in front of the first traction control valve TCV 1 .
  • the first oil chamber 131 may temporarily receive at least part of the brake oil discharged from the main braking system 20 therein.
  • Each of the circulation lines 141 and 142 is connected to the oil chamber 131 and 134 at one end, and to the outlet line 121 and 122 , adjacent to the entrance portions of the pumps SP 1 and SP 2 , at the other end.
  • the position at which the other end of the circulation line 141 or 142 is connected to the outlet line 121 or 122 is preferably formed backward of the accumulator A 1 or A 2 .
  • the first high pressure switching valve HSV 1 is disposed at a position on the first circulation line 141 , and the opening and closing of the first circulating line 141 are regulated by the first high pressure switching valve HSV 1 .
  • the first high pressure switching valve HSV 1 is formed as a normally close type. Thus, in the non-powered mode, the first high pressure switching valve HSV 1 is closed. When the first high pressure switching valve HSV 1 is opened, at least some of the brake oil contained in the first oil chamber 131 is provided to the actuating unit.
  • the auxiliary braking system 100 When the hydraulic pressure supplied from the reservoir 10 is not sufficient when the auxiliary hydraulic signal is applied, at least a part of the brake oil contained in the oil chambers 131 and 132 may be supplied to the actuating unit. Therefore, in the case where the brake oil is supplied from the reservoir 10 and increased in pressure, the auxiliary braking system 100 according to the present disclosure may have a quick responsiveness.
  • HSV high-pressure switching valve

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Regulating Braking Force (AREA)
  • Braking Arrangements (AREA)
US17/116,820 2020-11-10 2020-12-09 Electro-hydraulic braking system Active 2041-06-05 US11780418B2 (en)

Applications Claiming Priority (2)

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KR1020200149168A KR102441937B1 (ko) 2020-11-10 2020-11-10 전자유압식 브레이크 시스템
KR10-2020-0149168 2020-11-10

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KR (1) KR102441937B1 (ko)
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CN114454856A (zh) 2022-05-10
DE102020134994B4 (de) 2022-06-02
KR102441937B1 (ko) 2022-09-07
US20220144234A1 (en) 2022-05-12
KR20220063385A (ko) 2022-05-17
DE102020134994A1 (de) 2022-05-12

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